5G 1 5G mobile communication systems 1 5g 1 Cache hit ratio 1 Cache memory 1 Cache-enabled D2D transmitter 1 Cellular network 1 Content caching 1 Contents deliveries Multi-tier 1 Multitier cellular network 1 Network data 1 Proactive caching 1 Support vector machines 1 Transmitters 1 Wireless networks 1 cache-enabled D2D transmitter 1 content caching 1 content delivery 1 multitier cellular networks 1